The work of a student to solve the equation 3(2x – 4) = 8 + 2x + 6 is shown below:
step 1: 3...
Mathematics, 06.10.2019 02:20 newben
The work of a student to solve the equation 3(2x – 4) = 8 + 2x + 6 is shown below:
step 1: 3(2x – 4) = 8 + 2x + 6
step 2: 5x – 7 = 14 + 2x
step 3: 5x – 2x = 14 + 7
step 4: 3x = 21
step 5: x = 7
in which step did the student first make an error and what is the correct step? (5 points)
step 2; 6x – 12 = 14 + 2x
step 2; 6x – 7 = 2(6 + x + 4)
step 3; 5x – 2x = 14 – 7
step 3; 5x + 2x = 14 + 7
Answers: 1
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